Add README and jitpack file.

Author: RezzedUp

.jitpack.yml

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+jdk: openjdk11

README.md

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+# 📝 ConfigValues
+
+[![](https://jitpack.io/v/community.leaf/configvalues.svg)](https://jitpack.io/#community.leaf/configvalues "Get maven artifacts on JitPack")
+[![](https://img.shields.io/badge/License-MPL--2.0-blue)](./LICENSE "Project License: MPL-2.0")
+[![](https://img.shields.io/badge/Java-11-orange)](#java-version "Java Version: 11")
+[![](https://img.shields.io/badge/View-Javadocs-%234D7A97)](https://javadoc.jitpack.io/community/leaf/configvalues/latest/javadoc/ "View Javadocs")
+
+## Maven
+
+```xml
+<repositories>
+    <repository>
+        <id>jitpack.io</id>
+        <url>https://jitpack.io</url>
+    </repository>
+</repositories>
+```
+
+```xml
+<dependency>
+    <groupId>community.leaf.configvalues</groupId>
+    <artifactId>config-values-bukkit</artifactId>
+    <version><!--release--></version>
+</dependency>
+```
+
+### Versions
+
+Since we use JitPack to distribute this library, the versions available 
+are the same as the `tags` found on the **releases page** of this repository.
+
+### Shading
+
+If you intend to shade this library, please consider **relocating** the packages
+to avoid potential conflicts with other projects. This library also utilizes
+nullness annotations, which may be undesirable in a shaded uber-jar. They can
+safely be excluded, and you are encouraged to do so.
+